yeah this "feature" was not 100% intentional it was just because i put the pathfinding only on the middle of the street.
so the cars usally can overtake or change position in the corners or crossings.
I thought about "fixing" it but i thought it gives a little more depth because you need to drive a bit better to not block each other all the time. also to spice it up a little bit, the policecar is slightly faster than the ambulance.
Thanks for playing!